Mayser SG-RSV 239 is a control unit designed to monitor electrical resistance of connected sensors with a defined zero signal current. It has two monitoring circuits that operate the output relays, ensuring that when sensors are not activated, the output relays are energized. In case of a line disconnection between the sensor and the control unit, the "fault" relay is de-energized. The unit can be mounted on a 35 mm standard rail EN 50022 and can be used in various applications where monitoring of sensor resistance is crucial.
Mayser SG-RSV 239 is a control unit designed to monitor electrical resistance of connected sensors with a defined zero signal current. It has two monitoring circuits that operate the output relays, ensuring that when sensors are not activated, the output relays are energized. In case of a line disconnection between the sensor and the control unit, the "fault" relay is de-energized. The unit can be mounted on a 35 mm standard rail EN 50022 and can be used in various applications where monitoring of sensor resistance is crucial.
Mayser Polymer Electric Postfach 30 48 89020 Ulm Germany Tel. +49 731 2061-0 Fax +49 731 2061-222
130707 v1.2
Polymer Electric
Page 1/4
Control Unit SG-RSV 239 Operating Instructions
Control Unit
according to EN 50155 and
EN 50121‑3‑2
classes TX, S2 in accordance with
EN 50155
for sensors with
1.2 kΩ monitoring resistor
These operating instructions apply to the
following control units:
SG-RSV 239/24 24 V=
SG-RSV 239 50-150 V=
Control
The Control Unit has two monitoring cir-
cuits, which operate the output relays.
The electronics monitor the electrical
resistance of the connected sensors
which have a dened zero signal
current.
When the sensors are not activated
(normal operating conditions), the out-
put relays are energised. If the line is
disconnected between the sensor and
the control unit, the relay “fault” is
de-energised.
Enclosure
W × H × D (mm) 45 × 75 × 108
Protection class IP20
2 plug-in connectors each 8-channel
Cable clamps max. 2.5 mm
2
Weight approx 175 g
Parts supplied
‑ Control Unit
Enclosure with electronics module
and plug connections with lift-up lock
release.
‑ Operating Instructions
Sensor 1
Sensor 2
Mayser Polymer Electric Postfach 30 48 89020 Ulm Germany Tel. +49 731 2061-0 Fax +49 731 2061-222
130707 v1.2
Page 2/4
Technical Data
Connecting Voltage U
S
SG-RSV 239/24 DC 24 V (S2)
Voltage tolerance -30% to +30%
SG-RSV 239 DC 50 to 150 V (S2)
Nominal frequency -
Frequency tolerance -
Power consumption < 2 W
Sensor Voltage
max. 12 V DC
Signal Voltage State
max. U
s
Relay Data
Switching current max. 1 A max. 1 A
Switching voltage max. AC 250 V max. DC 150 V
Breaking capacity max. 250 W max. 30 W
(AC 12) (DC 12)
Switching operations
mechanical > 2× 10
7
electrical > 1× 10
5
(250 AC V / 1 A)
Operating Conditions
Perm. ambient temperature range -40 °C to +70 °C (T3)
Rel. humidity max. 95%
Endurance limit 5 g in all 3 levels
IMPORTANT NOTES! Please read!
To ensure correct and safe operation
of the unit, it must be properly trans-
ported and stored, properly installed
and commissioned, and operated in
accordance with its intended use.
Only persons familiar with the instal-
lation, commissioning and operation,
and with the corresponding qualica-
tions to prove their skills, may work on
the units.
They must observe the contents of
these instructions, the information
given on the type plate of the unit and
the relevant safety regulations for the
installation and operation of electrical
systems.
This unit is designed in accordance with
EN 50155 and EN 50121-3-2 and left
the factory in a perfectly safe condition.
To maintain this condition, you must
observe the safety regulations marked
WARNING! in these operating instruc-
tions. Failure to observe the safety
regulations can lead to death, injury to
personnel, or damage to the unit and
other systems and equipment.
Should the information given in these
operating instructions be inadequate
in any way, please contact your local
technical centre, subsidiary or rep-
resentative. When using the device
outside the European Union, you must
observe the relevant regulations valid
for the country of use.
Please note:
When switching inductive loads the user
must be tted out with spark absorbers
(RC-modules).
Important notes:
‑ Supply voltage
must be in accordance with the con-
necting voltage Us indicated on the
type plate.
‑ Permissible temperature range
maintain sufcient distance from heat
sources if installing in switch cabinet
(min. 2 cm).
‑ Fusing of the relay contacts
due to risk of welding, externally with
1.0 A inert.
Control Unit SG-RSV 239
Mayser Polymer Electric Postfach 30 48 89020 Ulm Germany Tel. +49 731 2061-0 Fax +49 731 2061-222
130707 v1.2
Polymer Electric
Page 3/4
Installation and Operation
Installation
The enclosure of the control unit can be
mounted in any position:
- on a 35 mm standard rail EN 50022
Wiring is connected to the cable clamps
of the plug connections:
Sensor 1 Y1 Y2
Sensor 2 Y3 Y4
Supply voltage A1 A2
Relay “fault” 13 14
Relay “activated” 23 24
Commissioning
After connecting up sensors, switching
contacts and power, carry out a function
test in the following order:
Sensor not actuated
- relay " activated " is energised
- relay " fault " is energised
Sensor actuated
- LED "Betätigt Kanal X" (activated
channel X) lights up
- relay " activated " is de-energised
Sensor disconnected
- LED "Störung Kanal X" (fault
channel X) lights up
- relay " fault " is de-energised
WARNING!
Do not release terminals or connect
plug connections with power on.
LEDs information
- LED (green) "Betrieb" (on)
Operating voltage active
- LED (yellow) "Betätigt Kanal X" (acti-
vated channel X)
Sensor actuated, relay "Betätigt"
(activated) de-energised
- LED (red) "Störung Kanal X" (fault
channel X)
Line sensor interrupted, relay "Stö-
rung" (fault) de-energised
- LED (red) "Störung allg." (general
fault)
Relay " fault " de-energised
Normal operation
Sensor X
actuated
yes
no
no
yes
"actuated" relay
de-energised
<10ms
>500ms
>10ms
Fault signals
yes
no
power supply
yes
no
fault
channel X
internal fault
yes
no
no
yes
"fault" relay
de-energised
fault
state
fault
state
autom. test
autom. test
autom. test
Mayser Polymer Electric Postfach 30 48 89020 Ulm Germany Tel. +49 731 2061-0 Fax +49 731 2061-222
130707 v1.2
Page 4/4
Subject to technical modifications.
Sensor not activated and Control Unit does not respond:
LED "Betrieb" (on) not lit
> Supply voltage off or incorrect.
Check supply voltage, compare with type plate.
Observe correct polarity.
Fault still exists: Control Unit faulty.
Replace Control Unit.
Sensor not activated and relay "fault" not energised:
LED "Störung Kanal X" (fault channel X) lit
> Sensor or supply lines faulty (connection interrupted).
Check sensor with gauge: set value = 1.2 kΩ ±2%.
Actual value ≠ set value: sensor or supply line faulty.
Replace sensor.
LED "Störung Kanal X" (fault channel X) not lit
> Control Unit faulty.
Connect resistor 1.2 kΩ instead of the sensor.
Fault still exists: Control Unit faulty.
Replace Control Unit.
Sensor interrupted and relay "fault" not de‑energised:
> Control Unit faulty.
Disconnect sensor.
Relay " fault " not deenergised: Control Unit faulty.
Replace Control Unit.
Sensor not activated and relay "activated" not energised:
LED "Betätigt Kanal X" (activated channel X) lit
> Sensor or supply line faulty (short-circuit).
Check sensor with gauge: set value = 1.2 kΩ ±2%.
Actual value ≠ set value: sensor or supply line faulty.
Replace sensor.
LED "Betätigt Kanal X" (activated channel X) not lit
> Control Unit is faulty
Connect resistor 1.2 kΩ instead of the sensor.
Fault still exists: Control Unit faulty.
Replace Control Unit.
Sensor actuated and relay "activated" not de‑energised:
LED "Betätigt Kanal X" (activated channel X) not lit
> Sensor or supply line faulty (resistance change too low).
Check sensor with gauge: set value " activated " < 300 Ω.
Actual value > 300 Ω : sensor or supply line faulty.
Replace sensor.
> Control Unit faulty.
Check sensor with gauge: set value " activated " < 300 Ω.
Actual value < 300 Ω : Control Unit faulty.
Replace Control Unit.
LED "Störung allg." (general fault) lit:
> Control Unit faulty.
Replace Control Unit.
Troubleshooting and remedies
Prerequisite: SG-RSV 239 connected to power supply and sensor.
Fault can still not be detected? - Mayser Support will help: Tel. +49 731 2061-0
Maintenance
The Control Unit is maintenance-free.
If no shorter testing intervals are speci-
ed, check the safety system monthly in
the following order:
1. Unit still switched off
Relay "fault" (13, 14) and Relay "acti-
vated" (23, 24) must be de-energised.
2. Switch unit on
Relay "fault" (13, 14) and relay "acti-
vated" (23, 24) must energise.
3. Activate sensor
Relay "activated" (23, 24) must
de-energise.
Maintenance and troubleshooting
-
1
-
2
-
3
-
4
Mayser SG-RSV 239 is a control unit designed to monitor electrical resistance of connected sensors with a defined zero signal current. It has two monitoring circuits that operate the output relays, ensuring that when sensors are not activated, the output relays are energized. In case of a line disconnection between the sensor and the control unit, the "fault" relay is de-energized. The unit can be mounted on a 35 mm standard rail EN 50022 and can be used in various applications where monitoring of sensor resistance is crucial.
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